1838108945 has 4 divisors (see below), whose sum is σ = 2205730740. Its totient is φ = 1470487152.

The previous prime is 1838108941. The next prime is 1838108959. The reversal of 1838108945 is 5498018381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 321162241 + 1516946704 = 17921^2 + 38948^2 .

It is a cyclic number.

It is not a de Polignac number, because 1838108945 - 2² = 1838108941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1838108945.

It is not an unprimeable number, because it can be changed into a prime (1838108941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183810890 + ... + 183810899.

It is an arithmetic number, because the mean of its divisors is an integer number (551432685).

Almost surely, 2^1838108945 is an apocalyptic number.

It is an amenable number.

1838108945 is a deficient number, since it is larger than the sum of its proper divisors (367621795).

1838108945 is an equidigital number, since it uses as much as digits as its factorization.

1838108945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367621794.

The product of its (nonzero) digits is 276480, while the sum is 47.

The square root of 1838108945 is about 42873.1727890531. The cubic root of 1838108945 is about 1224.9651957348.

The spelling of 1838108945 in words is "one billion, eight hundred thirty-eight million, one hundred eight thousand, nine hundred forty-five".